file_get_mtime
if(!file_get_mtime(fname, &mtime, &nonexist)) {
if (!file_get_mtime(zone->includes.paths[i], &include_mtime, &nonexist)) {
if(!file_get_mtime(zfile, &mtime, ¬exist)) {
int file_get_mtime(const char* file, struct timespec* mtime, int* nonexist);